In all honesty, a Sonic movie works better than, say, a Mario movie. Sonic already has viable voice actors, a supporting fleshed out cast, and many of the games have B movie plots already. It could work. The BOOM cartoons worked and so did previous cartoons likeSonic X, SATAM, AoStH, and the OVAs (we don't talk about Sonic Underground here).

I say, remain optimistic.